Question

define non ohmic resistors....
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Answer 1

Answer:

• Ohm law as usually formulated is linear (V=IR stated simply) . Not all materials behave in a linear fashion, and many have resistance that varies non linearly with current. I am going to suggest that any non linear behaviour is “non-Ohmic”

• A simple case is the domestic light globe. As the element heats, the resistance changes. A much more complex case is the semiconductor, where all manner of things can be arranged to happen. There are other materials beyond Silicon (and germanium) where the resistance functions are different . A common further example might Bimetallic strips offering a discontinuous function. Or light dependant resistors from cadmium for further example.

• The properties of all resistors have some non-ohmic tendencies. But much of the time can be approximately linear. Which is a good thing for many scenarios.